Fan mounting



Feb. 19, 1935. w, w, ALLEN 1,992,112

FAN MOUNTING Filed July 13, 1934 2 Sheets- 31166 1 William Wflllen Feb. 19, 1935. w. w. ALLEN 1,992,112

FAN MOUNT I NG Filed July 13, 1934 2 Sheets-Sheet 2 Mlliam PVT/{lien Patented Feb. 19, 1935 UNITED STATES PATENT OFFICE 4 Claims.

My present invention relates generally to fan mountings, having for a primary object the absorption of operating vibrations and the elimination of noises resulting therefrom, and my invention has in mind' more particularly the mounting of relatively large fans of low velocity such as those employed inexhausting air from the upper portions or attics of homes for the purpose of displacing the rising heated air and inducing influx of cool fresh air into the lower window and door openings.

With the above in mind, the several features of construction and operation, as well as the resulting advantages of my invention, will more clearly appear in the course of the following detailed description, reference being had to the accompanying drawings, which form a part of this specification, and in which,

Figure 1 is a front elevation illustrating the complete mounting, parts being broken away.

Figure 2 is a vertical section taken centrally therethrough on line 22 of Figure l, and,

- Figure 3 is an enlarged face view ofone corner portion.

Referring now to these figures, the fan contemplated by my invention is of the low velocity type, the blades 10 radiating from the fan shaft 11 and having their outer ends in connection with an annular ring or band 12.

The fan as a whole is mounted within a rectangular frame of greater height and width than the fan and' having thereacross at the discharge side of the fan, a wall 14 provided with an opening of approximately the diameter of the annular fan ring 12 as plainly seen by a comparison of Figures 1 and 2. At its opposite face, the top and bottom rails 15 and 16 of the fan fram e, are connected by a pair of spaced, parallel uprights 17 to which, at a central point, is attached a cross plate 18.

The cross plate 18 is apertured to receive the fan shaft 11 and carries a bearing member 19 for said shaft at one side of the plate 18 opposite to a pulley 20 which is secured to the fan shaft and is connected by a belt 21 with the shaft pulley 22 of a motor 23. This motor is mounted on a bracket 24 also secured to the uprights 1'7.

According to my invention, the fan frame supporting the fan and its actuating parts in the manner above described, and consisting of the top and bottom rails 15 and 16, and side rails 25, is spring supported in spaced relation within a larger similarly shaped supporting frame con-' sisting of top and bottom beams 26 and 27 and side beams 28. In most instances this supporting frame constitutes part of an air exhausting duct or flue and frequently is of wood, though not necessarily so.

Between the fan frame and the supporting frame, at spaced points therearound, are a series of coiled springs 29 under slight tension, the inner ends of which are anchored to the rails 15, 16 and 25, as by means of cross pins 30, and the outer ends of which are anchored to the beams 26, 27 and 28 as by means of screw eyes 31. These springs serve to float the fan frame in the supporting frame so as to absorb all vibration of the fan in operation and eliminate any noises which might result therefrom.

Since my proposa necessarily involve a space between the two frames and around the fan frame, which must-be covered to render the fan effective in use as an exhauster, I propose the use of a fabric covering 32 secured along its inner edge to the fan frame and along its outer edge to the supporting frame and extending across the space between these frames with a fullness as plainly seen in Figure 2 which leaves the fan frame free to vibrate without restriction and prevents recirculation of air around the fan frame.

By thus mounting the fan in a frame and flexibly supporting the fan frame within a second frame, I am able to employ a series of vibration absorbing springs of any necessary number, all short and of similar length and strength whereby the absorption is uniform around the entire frame and effective to a maximum degree in eliminating noise.

What I claim is:

1. In combination with an exhausting fan and its motor, a frame in which said fan and motor are mounted to operate, a supporting frame of the same shape as said fan frame, surrounding the latter and uniformly spaced therefrom entirely therearound, a series of springs between said frames and of similar length and strength, and an impervious fabric covering the space between the frames and having a fullness permitting said fan frame to vibrate freely within the springs.

2. In combination with an exhausting fan and its motor, a fan frame in which said fan and motor are mounted, a supporting frame circumjacent the fan frame and uniformly spaced therefrom entirely therearound, a series of tensioned springs of similar length extending between and connecting said frames at spaced points therearound whereby to floatingly support the fan frame, and a yieldable impervious covering extending across the space between said frames.

3. In combination with an exhausting fan and its motor, a rectangular frame in which said fan and its motor are mounted, a supporting-frame of similar shape and larger size as compared to said fan frame, surrounding the same in spaced relation, springs between the two frames for absorbing vibrations of the fan frame, and a yieldable covering extending across the space between said frames and impervious to air.

4. In combination, an exhausting fan having a central shaft, radial blades and a peripheral annular ring, a rectangular rigid frame having a flange around one side thereof and having a wall at the exhaust side of the fan provided with an opening of approximately the diameter of said fan ring, a pair of spaced apart uprights in said fan frame a cross member secured to said uprights and having a bearing support for said fan shaft, 21. motor supported on said uprights and having a driving connection with said fan shaft, a rectangular supporting frame around, and uniformly spaced from, said fan .frame, a series of coiled springs all of the same length and strength at spaced points around the fan frame, connected thereto and to the supporting frame, and a flexible fabric covering for the space between the frames, connected along its inner edge to the flange of the fan frame and along its outer edge to the supporting frame, said covering being impervious to air and having a fullness between its connected edges permitting'the fan frame to freely vibrate.

WILLIAM W. ALLEN. 

